Names of Angles

List and definition of individual names for the different kinds of angles. If for one angle a span between two values is given, both limiting values don't belong to that kind of angle.

0° zero angle

0° - 90° acute angle

90° right angle

90° - 180° obtuse angle

180° straight angle

180° - 360° reflex angle

360° perigon angle

Oblique are angles which are not integer multiples of 90°. Zero and perigon angle point to the same direction. The straight angle points to the opposite direction. The right angle is perpendicular to the original direction.